I don't think that'll happen because a PHP page is parsed by the PHP processor which reads the page, compiles it and then executes it (and it can be speeded up by 10 times using a proggy which makes a compiled version so it doesn't re-read it every time).

Anyway, the point is that only the PHP parser will read it and give an output. I'm presuming that a JSP page will work in much the same way, and in this case, you can't mix the languages!